AMX VIEWSTAT COMMUNICATING THERMOSTATS User Manual

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ViewStat

Communicating Thermostat

instruction manual

HVAC Controls

AMX Limited Warranty and Disclaimer

AMX Corporation warrants its products to be free of defects in material and workmanship under normal use for

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Table of Contents

Product Information .................................................................................................1

Introduction........................................................................................................................ 1

System Components ......................................................................................................... 2

ViewStat Specifications ..................................................................................................... 2

Support Module Specifications ......................................................................................... 3

Maximum Cable Distances ............................................................................................... 4

HVAC System Pre-Installation Check List......................................................................... 5

ViewStat Installation and Wiring .............................................................................7

Disconnecting Power to All HVAC Equipment .................................................................. 7

Selecting the Thermostat Location.................................................................................... 7

Stand-alone thermostat mounting criteria ................................................................................ 7

With remote temperature sensors............................................................................................ 8

Removing the Faceplate from the Base ............................................................................ 8

Setting the DIP Switch....................................................................................................... 9

Reassembly ............................................................................................................................. 9

Attaching the MiniVerter to the ViewStat......................................................................... 10

Wiring the VST-TSTAT to a VST-DIST Distribution Panel .............................................. 11

Mounting the Base to a Wall ........................................................................................... 13

Connecting the ViewStat to AMX Control Systems......................................................... 13

Connecting to an Axcess Control System (via AXC-232++, AXB-EM232, or Axcent3/PRO) 15

Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port .................. 16

Connecting to NetLinx Integrated Controllers via the RS232/422/485 (DB-9) Port ............... 17

Connecting to a NetLinx Master controller via NXC-COM card ............................................. 18

Connecting to a LandMark Control System ........................................................................... 19

Installing the Cat5 Suppression Ferrite .................................................................................. 19

Connecting to a NetLinx Control System ............................................................................... 20

Connecting to a Landmark Control System ........................................................................... 20

Connecting the ViewStat to the HVAC System ............................................................... 20

Installing the 24 VAC Suppression Ferrite ............................................................................. 20

Wiring the Thermostat .................................................................................................... 21

Communication and Equipment terminal wiring definitions.................................................... 21

Connecting the ViewStat to the HVAC System...................................................................... 22

Checking HVAC System Operation................................................................................. 25

Check Out Procedure............................................................................................................. 25

Optional HVAC Set-Up Features..................................................................................... 26

To access these HVAC set-up features................................................................................. 26

ViewStat Communicating Thermostat

Table of Contents

Address the Thermostats and Set Highest Address ....................................................... 27

Wiring Diagrams.............................................................................................................. 29

Single-stage furnace and AC configuration............................................................................ 29

Two-stage furnace and two-stage AC configuration. ............................................................. 30

Roof top unit (two-stage heat and two-stage cool) configuration. .......................................... 31

Boiler with AC (two transformers) configuration..................................................................... 32

Single-stage heat pump configuration.................................................................................... 33

Two-stage heat pump configuration....................................................................................... 34

First- stage radiant floor heat, second-stage furnace one stage of cooling configuration...... 35

Support Module Installation and Wiring ..............................................................37

Installing the VST-TTM and VST-TRH Support Modules................................................ 37

Choosing a mounting location................................................................................................ 37

Single Support Module Installation......................................................................................... 37

Multiple Support Module Installation ...................................................................................... 39

Setting the Support Module DIP Switches ...................................................................... 40

DIP switches 1 and 2: Address (1-4)...................................................................................... 40

Dip switch 4: Humidity Sensor 2 (VST-TRH support module only)........................................ 41

DIP switch 6: T1/T2 or Onboard Sensor ................................................................................ 41

Applications..................................................................................................................... 42

Heat Pump Applications......................................................................................................... 42

Humidity Control (VST-TRH only) .......................................................................................... 42

Troubleshooting Remote Sensors................................................................................... 43

Set Up and Configuration ......................................................................................45

Network Override Set-Up ................................................................................................ 46

Thermostat Button Lockout ............................................................................................. 46

Security Set-Up ............................................................................................................... 47

Communications Set-Up ................................................................................................. 48

Temperature Set-Up ....................................................................................................... 48

Backlighting Set-Up......................................................................................................... 48

Balance Point Set-Up...................................................................................................... 49

Display Set-Up ................................................................................................................ 49

Using the NetLinx Module to Program the ViewStat ........................................... 51

AMX_ViewStat NetLinx Module - Overview .................................................................... 51

The ViewStat Model ........................................................................................................ 53

Command Interface - SEND_COMMANDs..................................................................... 53

String Feedback .............................................................................................................. 59

ViewStat Communicating Thermostat

Table of Contents

Operating the Thermostat ......................................................................................63

Front Panel Components ................................................................................................ 63

Message Display.................................................................................................................... 63

Scroll/Set-up buttons.............................................................................................................. 63

Mode button ........................................................................................................................... 63

Adjust buttons ........................................................................................................................ 64

Fan button .............................................................................................................................. 64

Enter button............................................................................................................................ 64

Main display ........................................................................................................................... 64

Operating The Thermostat .............................................................................................. 65

Selecting the Mode ................................................................................................................ 65

Setting temperatures.............................................................................................................. 66

Fan operation ......................................................................................................................... 66

Backlight operation................................................................................................................. 66

Network override .................................................................................................................... 66

Clearing a temporary flashing message................................................................................. 66

In Case Of Power Failure ................................................................................................ 67

Cleaning the Thermostat ................................................................................................. 67

ViewStat Communicating Thermostat

iii

Table of Contents

ViewStat Communicating Thermostat

Product Information

Introduction

The ViewStat Communicating Thermostat (FIG. 1) operates similarly to a conventional thermostat

but has the unique capability of being controlled, either locally or remotely from a NetLinx or

Landmark control system. The ViewStat is compatible with any 24-volt controlled HVAC system,

as well as millivolt systems. This manual describes how the ViewStat connects to several different

types (see theViewStat Installation and Wiring section on page 7).

If there are any specific wiring needs or unusual wiring configurations please contact AMX Technical Support, and we will endeavor to find the answer, before your installation.

If necessary, contact AMX Technical Support for help with additional specific control wiring

scenarios.

Product Information

Message display

Main display

hinged

front panel

Mode

button

Adjust buttons

Mode button

FIG. 1 ViewStat Communicating Thermostat

Enter button Fan button

Scroll/Setup buttons

Communication terminals

base

HVAC Equipment terminals

The ViewStat is designed to work with VST-TTM (Temperature) and VST-TRH (Temperature and

Humidity) support modules, and remote sensors.

For information on using the VST-TSTAT with an (optional) VST-DIST Distribution Panel for RS422 control, refer to the Wiring the VST-TSTAT to a VST-DIST Distribution Panel section on page 11.

iewStat Communicating Thermostat

Product Information

(Cont.)

System Components

The components in a complete ViewStat system (including optional accessories) are listed below:

System Components

Component Name Description

ViewStat (VST) Communicating thermostat

VST-TTM Temperature support module (optional)

VST-TRH Temperature/Humidity support module (optional)

VST-TSF Flush-mount remote sensor Indoor flush-mount temperature/relative humidity sensor (optional)

VST-TSO Duct/Outdoor remote sensor Duct/Outdoor-mount temperature/relative humidity sensor (optional)

VST-DIST Distribution Panel

ViewStat Specifications

Control Ports • HVAC control

• ICSNet

Control Voltage 24 VAC ±20% or 24 VDC ±20% (delivered by an HVAC system or by an external

power supply)

Switched Voltage 18 – 30 VAC

Maximum Operating Current • 2 amps total at rated voltage, through all outputs.

• 1 amps through any one output.

Maximum Surge Current 2.0 A

Control Accuracy ±1.0° F (± 0.56° C)

Control Range 40° – 90° F (4.44° – 32.22° C)

Operating Range 32° – 99° F (0° – 37.22° C)

Baud Rate 9600

Front Panel Components:

Message display Two types of messages are displayed, Permanent and Temporary Messages.

• Permanent Messages are those that scroll continually during thermostat operation.

• Temporary (flashing) Messages are intended to catch your eye and must be reset to be removed from the display.

Thermostats are shipped with default (permanent) status messages (i.e. mode status, fan status, equipment status).

Scroll/Set-up buttons The Scroll/Set-Up buttons function with the set-up features of the thermostat

(see theSet Up and Configuration section on page 45). These buttons are located beneath the faceplate.

Main LCD display The MAIN DISPLAY (see FIG. 16 on page 25) provides the mode status, tem-

perature and system status information.

Mode button Five modes of operation are available: OFF, COOL, HEAT, AUTO, and EM.

HEAT (for heat pumps only). The mode of operation indicates how you want your heating and cooling equipment to operate. This button is located beneath the faceplate.

Fan button The fan can be operated continuously (FAN ON) or only when there is a need to

heat or cool. This button is located beneath the faceplate.

Enter button The Enter (or Network Override) button is used to override the home automation

system, to clear temporary flashing messages on the message display and with the set-up features of the thermostat.

Adjust buttons The Adjust buttons adjust the heating and cooling temperature settings.

ViewStat Communicating Thermostat

Product Information

ViewStat Specifications (Cont.)

Circuit Board Components:

Communication and HVAC Equipment connectors

DIP Switch 4-position DIP switch that configures the thermostat for various application types

Enclosure:

Material White plastic with hinged faceplate and removable front panel.

ViewStat Dimensions (HWD)

Weight 5.29 oz. (150 grams)

Included Accessories • Cat5 Suppression Ferrite

Optional Accessories • VST-TTM Remote Temperature support module (FG944-10)

Remote Temperature Sensors:

VST-TSF Dimensions: • Cable length: 9.00"(228 mm)

VST-TSO Dimensions (HWD):

Weight: • VST-TSF: 0.5 lb (0.23 kg)

Terminals with captive-wire connectors that connects the Thermostat, HVAC equipment, control system, remote sensors and power supply. Refer to the Wir- ing the Thermostat section on page 21 for details.

(Servant/Master, Electric/Fossil, Single/Multi, Heat Pump/Heat-Cool). Refer to the Setting the DIP Switch section on page 9 for details.

5.01" x 5.52" x 1.15" (12.72 cm x 14.02 cm x 2.92 cm)

• 24 VAC Suppression Ferrite

• VST-TRH Remote Temperature/Humidity support module (FG944-20)

• VST-TSF Flush-mount indoor remote sensor (FG944-30)

• VST-TSO Duct/outdoor remote sensor (FG944-40)

• Sensor depth: 0.85" (22 mm)

• Sensor diameter: Ø1.50 (Ø38 mm)

• 2.75" x 1.44" x 1.75 (70 mm x 37 mm x 44 mm)

• VST-TSO: 0.75 lb (0.34 kg)

Support Module Specifications

There are two types of support modules available for the ViewStat:

 VST-TTM Temperature Module: The VST-TTM support module offers versatility in

climate control. A set of onboard dip switches on the VST-TTM circuit board allow you

to determine whether you want the two remote temperature sensor inputs to control,

monitor or do a combination of both. This temperature data is sent back to the ViewStat

Thermostat, allowing you to accurately control and monitor temperature in a given area

or multiple areas.

 VST-TRH Temperature and Humidity Module: The VST-TRH support module brings

further versatility to the HVAC system. A set of onboard dip switches on the VST-TRH

circuit board allow you to determine whether you want the two remote temperature

sensor inputs to control, monitor, or both. The temperature/humidity data is sent back to

the ViewStat, allowing you to accurately control and monitor temperature/humidity in a

given area or multiple areas.

iewStat Communicating Thermostat

Product Information

The ViewStat supports up to four Support Modules, and can display any one of the following:

 The remote temperature on support module address 1 if its mode is set to "Control".

 The average temperatures of all support modules set to "Control" mode.

 The humidity of the VST-TRH (Temperature and Humidity Module) set to "Control"

mode.

VST-TTM and VST-TRH Remote Sensor Specifications

Power supply 18 to 30 VAC or DC (24 V Nominal)

Support Module Dimensions (HWD) 2.50" x 3.50" x 0.88"

(63 mm x 89 mm x 22 mm)

Max. relative humidity 90% (non-condensing)

Temperature:

• Accuracy: Comfort Range: (60°F - 80°F): ± 1°F

Control Range: (40°F - 100°F): ± 2°F

Operating Range: (-40°F - 185°F): ± 3°F

• Maximum Display Range: -40°F - 185°F

Humidity (VST-TRH only):

• Accuracy: Comfort Range: (10% - 45%): ± 3%

Control Range: (10% - 90%): ± 5%

• Maximum Display Range: 0% - 90%

Refer to theSupport Module Installation and Wiring section on page 37 for information on configuring, installing and wiring the support modules and remote temperature sensors.

Maximum Cable Distances

Between the VST and NetLinx or LandMark Controller: 1000’ (304.8m)

Between support module and VST: 1000’ (304.8m)

•Max. cumulative cable length between multiple support modules and VST: 1000’ (304.8m)

Between support module and remote sensor: 300’ (91.44m)

ViewStat Communicating Thermostat

Product Information

HVAC System Pre-Installation Check List

Before getting started, determine what type of heating system is/will be installed in the house. Then

use the following table to determine if the proper numbers of wires are available, depending on the

HVAC System type.

HVAC System Pre-installation Check List

Application # of HVAC Wires Wiring Diagram

Single Stage Furnace & AC 5 FIG. 18 on page 29

Two Stage Furnace & Two Stage AC 7 FIG. 19 on page 30

Roof Top Unit (Two Stage Heat & Two Stage Cool) 7 FIG. 20 on page 31

Boiler with AC (Two Transformers) 5 FIG. 21 on page 32

Single Stage Heat Pump 7 FIG. 22 on page 33

Two Stage Heat Pump 9 FIG. 23 on page 34

First Stage Radiant Floor Heat Second Stage Furnace One Stage of Cooling 6 FIG. 24 on page 35

In addition to the wires necessary to support the HVAC system control, an RJ45terminated Cat5 cable is necessary to support NetLinx or Landmark communications (see theViewStat Installation and Wiring section on page 7 for details).

iewStat Communicating Thermostat

Product Information

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

This section covers the installation, wiring and checkout of a ViewStat Communicating Thermostat

System.

1. 120 volts may cause serious injury from electrical shock. Disconnect electrical power to the HVAC system before starting installation. This system is a low-voltage system.

2. Improper installation may cause serious injury from electrical shock. This system must be installed by a qualified contractor in accordance with NEC Standards and applicable local and state codes.

Disconnecting Power to All HVAC Equipment

Since the ViewStats are wired directly to the HVAC equipment, the power must be shut off at the

equipment. This can generally be accomplished by turning off the disconnect switch located near

the equipment. If an obvious disconnect switch is unavailable, you will need to remove the circuit

breaker or shut down the fuse serving the equipment.

Failure to disconnect power could result in damage to the HVAC equipment or thermostats. Leave power disconnected until all other electrical connections have been made and checked for accuracy.

ViewStat Installation and Wiring

Selecting the Thermostat Location

Determine if the thermostat will be operating alone, or with remote temperature sensors. If the unit

is stand-alone there are certain measures that must be taken to ensure accurate temperature control.

Stand-alone thermostat mounting criteria

 One ViewStat per HVAC system.

 Mount on an interior wall.

 In a room frequently occupied.

 At least 18 inches (45.72 cm) from any outside wall.

 Approximately 5 feet (1.52 m) above the floor. Check with local building codes for height

requirements in commercial applications.

DO NOT locate the thermostat:

 Behind doors, in corners or other dead air spaces.

 In direct sunlight or near lamps, appliances or other sources of radiant heat.

 On an outside wall or wall exposed to an unconditioned space (i.e. garage, etc.).

 In the flow path of a supply register, in stairways or near outside doors.

 On a wall where concealed pipes and/or duct work will affect the thermostat.

 Near sources of electrical interference such as arcing relay contacts.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

With remote temperature sensors

Follow the guidelines for placement of the sensors and locate the thermostat indoors where

operating range (see specs) will not be violated (i.e. do not install in a cold garage or hot equipment

room). See the Support Module Installation and Wiring section on page 37 for details.

Removing the Faceplate from the Base

No tools are required to disassemble the thermostat – just use your hands to pull the front panel off

of the base (FIG. 2).

FIG. 2 Pulling the front panel off of the base

Loss of internal programs may result from static discharge to thermostat circuit board. Touch a grounded metal object to discharge any static charge before handling the circuit board.

While holding the base of the thermostat, apply pressure to the base of the latch with your thumb

(FIG. 3). Both sides have a latch, but it is easiest to unlatch one side at a time.

Press base here

FIG. 3 Location of latch on base (one latch on each side)

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Setting the DIP Switch

Set the DIP switch located on the thermostat circuit board (FIG. 4) according to the application

needs (see the DIP Switch Settings table below for details).

FOSSIL

MULTI

ELECTRIC

H/C

SINGLE

HT.PUMP

MASTER

OFF

SERVANT

FIG. 4 Setting the DIP Switch

The following table shows what each switch corresponds to depending on position. Switch one

should be set in the “OFF Servant” position unless you plan to broadcast readings from remote

temperature sensors to other thermostats in the system when there is no control system in place.

DIP Switch Settings

Application Switch #1 Switch #2 Switch #3 Switch #4

Single Stage Furnace & AC Servant Fossil Single H/C

Two Stage Furnace & Two Stage AC Servant Fossil Multi H/C

Roof Top Unit (Two Stage Heat & Two Stage Cool) Servant Fossil Multi H/C

Boiler with AC (Two Transformers) Servant Fossil Single H/C

Single Stage Heat Pump Servant Electric Single HT. Pump

Two Multi-stage Heat Pump Servant Electric Multi HT. Pump

First Stage Radiant Floor Heat, Second Stage Furnace One Stage of Cooling

Servant Fossil Multi H/C

Reassembly

No tools required – line up pins on circuit board with the corresponding terminal blocks. Use your

hands to push the front panel securely to the mounted base.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

(black)

Attaching the MiniVerter to the ViewStat

Before attaching the MiniVerter to the rear of the ViewStat, connect the wiring, as described below:

1. Detach the faceplate from the base of the ViewStat.

2. Pull the stripped/tinned wires through the cutout in the center of the base (FIG. 5).

ommon from 24 VAC HVAC System

Power (red) from 24 VAC HVAC System

Powe r

Terminal

cutout

jumper from RC to RH

Equipment

Communication Te r m in a l

from Miniverter

FIG. 5 ViewStat base with Communication, Power and Equipment terminals

terminal

Before mounting the ViewStat, you must attach the MiniVerter to the rear panel of the ViewStat, as

described below:

1. Detach the faceplate from the base of the ViewStat.

2. Pull the stripped/tinned wires through the cutout in the center of the base (FIG. 5)

3. Connect the communications wiring:

a. Blue to B-

b. Orange to B+

c. Red/White to A-

d. Black/White to A+

4. Connect the power wiring:

a. Black to C

b. Red to R

5. Install a jumper from RH to RC.

6. Insert the MiniVerter (connector-side first) into the guide-slots located on the bottom of the

MiniVerter mounting bracket (FIG. 6).

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

ViewStat base (top view)

Insert the MiniVerter

(connector-side down)

inside the mounting bracket.

mounting bracket

FIG. 6 Inserting the MiniVerter into the mounting bracket (top view).

into the guide slots

MiniVerter

Snap into place

Slide the MiniVerter into

locking position in the bracket.

MiniVerter card

7. Slide the MiniVerter back into its locking position in the mounting bracket.

8. With the connector-side of the MiniVerter seated in the guide-slots, gently press the opposite

side of the MiniVerter in and down, to snap it into its locked position on the mounting bracket.

Repeated installation and removal of the MiniVerter bracket may result in damage to the bracket.

9. Connect the Cat-5 RJ-45 connector on the MiniVerter to the Control System (Master or ICSNet

Hub).

Wiring the VST-TSTAT to a VST-DIST Distribution Panel

The optional VST-DIST Distribution Panel (not included) connects to up to eight VST-TSTAT

thermostats, providing a convenient and effective method of wiring multiple thermostats to the

control system's RS422 serial interface port.

The VST-DIST provides one RS422 interface to the control system and eight RS422 interfaces for

the thermostats.

 Since the VST-DIST provides an RS422 interface to the control system, a MiniVerter

(VST-MVRT) is not required for communication.

 The VST-DIST is intended for use with the VST-TSTAT, and is not intended for use with

the VST, which includes a MiniVerter.

The VST-DIST includes an Instruction Manual from the manufacturer with detailed installation instructions, and a decal on the inside of the front cover (reproduced in FIG. 7) gives wiring information for the panel.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

Communications

Wire to Protocol Adapter, other Distribution Panels or directly to Automation System A: Transmit B: Receive

REF

Rx+

Rx-

Tx+

Tx-

Switches

A - Allows Transmit

Communications B - Allows Received Communications PWR - Turns power to thermostat on/off

LEDs light when communications are transmitted (A) or received (B)

24VAC

GND

ADDRESS #

Transformer

24 V, 40 VA minimum up to 8 thermostats

C - 24 V (common) (-) if DC R - 24 V (hot) (+) if DC

Main Power Switch

Turns main power to Distribution Panel on/off

FIG. 7 Wiring the VST-TSTAT to a VST-DIST Distribution Panel

ADDRESS #

LED will light up when power to thermostat is switched on

ADDRESS #

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Mounting the Base to a Wall

There are four screw holes located on the base of the thermostat; two are for a junction box

mounting, along with two for alternate mounting spacing. Use one of the holes on the top and one

on the bottom.

1. Place the base over the wire hole opening in the wall; level the base and mark the screw hole

mounting locations (leveling required for appearance only).

2. If using supplied wall anchors, drill 3/16" hole in the center of the marked locations and tap in

the wall anchors. If using the supplied screws only, drill a 3/32" hole in the center of the

marked locations.

Minimize wire entry hole size and seal – drafts from inside the wall could affect temperature readings.

3. Fasten the base to the wall with the supplied screws.

4. Seal wire entry using caulk, drywall putty or insulation.

Loss of internal programs may result from static discharge to thermostat circuit board. Installer must touch a grounded metal object before handling the circuit board.

Connecting the ViewStat to AMX Control Systems

When a Mini Verter is used the Viewstat has a single RJ-45 jack on the rear panel, and uses ICSNet

cabling to connect to NetLinx or Landmark control systems.

The terms "PhastLink" and ICSNet" are essentially interchangeable within the context of cabling/connectors. They both use a standard 10BaseT type connection (i.e. Category 5 wire and RJ-45 connectors), and they share the same pinout information for the RJ-45 jacks. Generally the term "PhastLink" is used when dealing with Landmark, and "ICSNet" is used when describing NetLinx control systems.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

The wires should be connected in the standard manner described in the following table. If standard

EIA/TIA 568A/B color coding is followed, wiring problems will be minimized

PHASTLink RJ-45 Pinout Information (EIA/TIA 568 A)

Pin Wire Color Polarity Function

1 White/Green + Transmit

2 Green - Transmit

3 White/Orange - Mic

4 Blue - Ground

5 White/Blue + 12 VDC

6 Orange + Mic

7 White/Brown + Receive

8 Brown - Receive

TIA 568A

1 2 3 4 5 6 7 8

(female)

NetLinx RJ-45 Pinout Information (EIA/TIA 568 B)

Pin Wire Color Polarity Function

1 Orange/White + Transmit

2 Orange - Transmit

3 Green/White - Mic

4 Blue - Ground

5 White/Blue + 12 VDC

6 Green + Mic

7 White/Brown + Receive

8 Brown - Receive

TIA 568B

It is important that the correct pairing is observed. Transmit, Receive, and Mic need to be on twisted pairs. Splitting pairs (e.g., using a white/green wire with a blue/ white wire for transmit) will result in increased crosstalk, and may result in bus failure or noise on the intercom.

1 2 3 4 5 6 7 8

(male)

RJ-45 connector pin configurations

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Connecting to an Axcess Control System (via AXC-232++, AXB-EM232, or Axcent3/ PRO)

To connect the ViewStat to an Axcess control system via an Axcess Cardframe (cardframe must be

equipped with an AXC-232 232/422/485 Control Card), AXB-EM232 Enhanced Master, or

Axcent3(PRO) Controller, refer to the card-edge pinout information below:

Axcess System Card Edge Pinouts

Pin Signal Function

1 GND Ground (RS-232)

2 RX Receive data (RS-232)

3 TX Transmit data (RS-232)

4 +12V Power

5 RX - Receive data (RS-422)

6 RX + Receive data (RS-422)

7 TX - Transmit data (RS-422)

8 TX + Transmit data (RS-422)

9 GND Ground

10 CTS Clear-to-send (hardware handshaking)

11 RTS Ready-to-send (hardware handshaking)

12-16 not used

FIG. 8 shows the wiring configuration for Axcess systems:

ViewStat (Communication terminal)

FIG. 8 Connecting the ViewStat to an Axcess Control System

Axcess Control System

AXC-232(++) or AXB-232(++)

iewStat Communicating Thermostat

ViewStat Installation and Wiring

Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port

The table below lists the connector pins, signal types, and signal functions for RS-232/RS-422/RS-

485 DB-9 (male) connector on an Axcess Master Controller (i.e. Axcent3 or Axcent3/PRO).

DB-9 Pinouts Wiring and Baud Configurations

Pin Signal Function RS-232 RS-422 RS-485

1 RX- Receive data X X (strap to pin 9)

2 RXD Receive data X

3 TXD Transmit data X

4 TX+ Transmit data X X (strap to pin 6)

5 GND Signal ground X X

6 RX+ Receive data X X (strap to pin 4)

7 RTS Request to send X

8 CTS Clear to send X

9 TX- Transmit data X X (strap to pin 1)

FIG. 9 shows the wiring configuration for Axcess systems (using the DB-9 PROGRAM port).

The X’s show where to terminate the wires on the DB-9 connector.

ViewStat (Communication terminal)

FIG. 9 Connecting the ViewStat to an Axcess Control System via the RS232/422/485 (DB-9) port

RS232/422/485 Por t

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Connecting to NetLinx Integrated Controllers via the RS232/422/485 (DB-9) Port

The table below lists the connector pins, signal types, and signal functions for RS-232/RS-422/RS-

485 DB-9 (male) connector on an NetLinx Integrated Controllers (i.e. NI-2000/3000/4000).

DB-9 Pinouts Wiring and Baud Configurations

Pin Signal Function RS-232 RS-422 RS-485

1 RX- Receive data X X (strap to pin 9)

2 RXD Receive data X

3 TXD Transmit data X

4 TX+ Transmit data X X (strap to pin 6)

5 GND Signal ground X X

6 RX+ Receive data X X (strap to pin 4)

7 RTS Request to send X

8 CTS Clear to send X

9 TX- Transmit data X X (strap to pin 1)

The X’s show where to terminate the wires on the DB-9 connector.

FIG. 9 shows the wiring configuration for NetLinx systems (using the DB-9 PROGRAM port).

ViewStat (Communication terminal)

FIG. 10 Connecting the ViewStat to an NetLinx Integrated Control System via the RS232/422/485 (DB-9) port

iewStat Communicating Thermostat

RS232/422/485 Por t

ViewStat Installation and Wiring

Connecting to a NetLinx Master controller via NXC-COM card

The Viewstat can connect to a NetLinx NXF Cardframe or NXI equipped with a NXC-COM Dual

COM Port Control Card. The following table shows the card edge pinout information for the NXC-

COM card.

NXC-COM2 Pinouts NXC-COM2 Wiring Configuration

Pin Signal Function RS-232 RS-422 RS-485

1 GND Signal ground X X

2 RXD1 Receive data X

3 TXD1 Transmit data X

4 CTS1 Clear to send X

5 RTS1 Request to send X

6 TX1+ Transmit data X X (strap to pin 8)

7 TX1- Transmit data X X (strap to pin 9)

8 RX1+ Receive data X X (strap to pin 6)

9 RX1- Receive data X X (strap to pin 7)

10 +12 VDC Power Optional Optional

11 GND Signal ground X X

12 RXD2 Receive data X

13 TXD2 Transmit data X

14 CTS2 Clear to send X

15 RTS2 Request to send X

16 TX2+ Transmit data X X (strap to pin 18)

17 TX2- Transmit data X X (strap to pin 19)

18 RX2+ Receive data X X (strap to pin 16)

19 RX2- Receive data X X (strap to pin 17)

20 +12 VDC Power Optional Optional

FIG. 11 shows the wiring configuration for NetLinx systems.

ViewStat (Communication terminal)

FIG. 11 Connecting the ViewStat to a NetLinx Control System

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Connecting to a LandMark Control System

PhastLink cables are used to connect all PhastLink-compatible devices, including keypads,

dimmers, J-box IR devices, amplifiers, audio switches, etc. The table below lists the RJ-45 pinout

information.

RJ-45 Pinout Information

Pin Wire Color Polarity Function

1 White/Green + Transmit

2 Green - Transmit

3 White/Orange - Mic

4 Blue - Ground

5 White/Blue + 12 VDC

6 Orange + Mic

7 White/Brown + Receive

8 Brown - Receive

PhastLink uses a standard 10Base-T connection (i.e. Category 5 wire and RJ-45 connectors). The

wire should be connected in the standard manner. If a consistent color code is used, wiring

problems will be minimized.

It is important that the correct pairing is observed. Transmit, Receive, and Mic need to be on

twisted pairs. Splitting pairs (e.g., using a white/green wire with a blue/white wire for transmit) will

result in increased crosswalk, and may result in bus failure or noise on the intercom.

Installing the Cat5 Suppression Ferrite

Before connecting the ICSNet cable, install the Cat5 Suppression Ferrite (provided), as described

below (no tools required):

Release the latch to open the plastic enclosure.

FIG. 12 Installing the Cat5 Suppression Ferrite

Insert the Cat5 cable and close the enclosure.

Installation complete.

1. The Cat5 suppression ferrite is housed in a plastic enclosure, with a latch release on one side.

Pull to release the latch and open the enclosure.

2. Insert the Cat5 cable.

3. Snap the enclosure shut with the cable inside, and you’re done.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

Connecting to a NetLinx Control System

To connect a single ViewStat to a NetLinx control system, use ICSNet cabling to connect the

RJ-45 jack on the ViewStat to any available ICSNet jack on the NetLinx Master. The maximum

cabling distance between the ViewStat and Master is 1,000 ft (304.8 m).

To connect multiple ViewStats to a NetLinx system, use a NetLinx Hub (NXC-NH) to add additional

ICSNet ports to the system, connect the RJ-45 jack on the ViewStat to an available ICSNet jack on

the Hub.

Connecting to a Landmark Control System

To connect a single ViewStat to a Landmark control system, use PhastLink cabling to connect the

RJ-45 jack on the ViewStat to any available PhastLink jack on the Landmark Master (MCU). The

maximum cabling distance between the ViewStat and MCU is 1,000 ft (304.8 m).

To connect multiple ViewStats to a Landmark system, use a Landmark Hub (PLH-RPT) to add

additional PhastLink ports to the system, connect the RJ-45 jack on the ViewStat to an available

PhastLink jack on the Hub.

Connecting the ViewStat to the HVAC System

Before connecting the ViewStat to the HVAC system, install the 24 VAC Suppression Ferrite, to

eliminate any potential noise problems.

Installing the 24 VAC Suppression Ferrite

Before connecting the 24 VAC power supply cable to the HVAC system, install the 24 VAC

Suppression Ferrite (provided), as described below (no tools required):

Pass the 24VAC power cord through the ferrite bead.

FIG. 13 Installing the 24 VAC Suppression Ferrite

Loop the cable around and pass it through the ferrite bead again.

Gently pull the cable to eliminate excess slack - installation complete.

1. Pass the 24 VAC power cable through the ferrite bead once.

2. Loop the cord around, and pass it through the ferrite bead once more.

3. Gently remove any excess slack in the cable, and you’re done.

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Wiring the Thermostat

1. Strip 1/4" (0.63 cm) of insulation from each wire to be used.

2. Secure wires into the terminals on the base according to the appropriate wiring diagram, as

described in the following table. Refer to the Wiring Diagrams section on page 29. Use color-

coding practices (i.e. white wire to W terminal) whenever possible.

• Single Stage Furnace & AC Refer to FIG. 18 on page 29

• Two Stage Furnace & Two Stage AC Refer to FIG. 19 on page 30

• Roof Top Unit (Two Stage Heat & Two Stage Cool) Refer to FIG. 20 on page 31

• Boiler with AC (Two Transformers) Refer to FIG. 21 on page 32

• Single Stage Heat Pump Refer to FIG. 22 on page 33

• Two Stage Heat Pump Refer to FIG. 23 on page 34

• First Stage Radiant Floor Heat Second Stage Furnace One Stage of Cooling

3. Check each wire to ensure it is securely fastened, not broken, and exposed wires are not

touching.

Communication and Equipment terminal wiring definitions

Refer to FIG. 24 on page 35

The following table describes the Communication and Equipment terminal wiring definitions (see

FIG. 5 on page 10).

Communication and Equipment Terminal Wiring Definitions

Communication Terminal

C Thermostat Voltage (common)

R Thermostat Voltage (hot)

RSR (support module) Thermostat Voltage (hot)

RSC (support module) Thermostat Voltage (common)

RSB/RSA (support module) Support module communication (half-duplex)

REF Ground Reference

B-/B+ Receive

A-/A+ Transmit

Equipment Terminal

RC Switched Voltage (cool)

RH Switched Voltage (heat)

RV COOL (O) Reversing Valve - Cool (energized in Cool mode)

RV HEAT (B) Reversing Valve - Heat (energized in other modes)

GFan

HUM/W1 1st stage Heat (non-heat pump)

-or3rd stage Heat AND 1st Stage Emergency Heat (heat pump)

-orHumidification (with humidity control sensor)

iewStat Communicating Thermostat

ViewStat Installation and Wiring

Communication and Equipment Terminal Wiring Definitions (Cont.)

Equipment Terminal (Cont.)

DEH/Y1 1st stage Cooling (non-heat pump)

W2 2nd stage Heat (non-heat pump)

Y2 2nd stage Cooling (non-heat pump)

Connecting the ViewStat to the HVAC System

A qualified HVAC technician should perform these steps step to ensure proper termination.

1. Make sure the HVAC system power is off.

2. The following figures (FIG. 14, FIG. 15) show wiring diagrams for several different HVAC

equipment types. Use these diagrams as a reference only. Use color coding where possible.

-or1st stage Compressor (heat pump)

-orDehumidification (with humidity control sensor)

-or2nd stage Emergency Heat (heat pump)

-or2nd stage Compressor (heat pump)

a. FIG. 14 shows a typical heat/cool wiring schematic:

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

MULTI-STAGE FURNACE

2ND

STAGE

HEAT

FAN

RELAY

2ND STAGE

1ST STAGE

1ST

STAGE

HEAT

VAC

120

VAC

COOL

MULTI-STAGE A/C

2ND

1ST STG

COOL

STG

COOL

CAUTION!

ENSURE HVAC SYSTEM POWER

IS OFF BEFORE WIRING

Black

(common)

(from MiniVerter)

FIG. 14 Typical heat/cool wiring schematic

USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

C R RSR RSC RSB RSA REF

BB+ AA+ B

REFER TO THE THERMOSTAT INSTALLATION SHEET FOR INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT PROCEDURES AND OTHER HVAC WIRING DETAILS

RC RH

O G

Red (power)

iewStat Communicating Thermostat

ViewStat Installation and Wiring

b. FIG. 15 shows a typical heat/cool wiring schematic:

OUTDOOR HEAT PUMP UNIT

USE 18-20 GA. THERMOSTAT CABLE. NUMBER OF CONDUCTORS REQUIRED DEPENDS ON THE HVAC SYSTEM BEING CONTROLLED

CAUTION!

ENSURE HVAC SYSTEM POWER

IS OFF BEFORE WIRING

INDOOR BLOWER/HEAT

REFER TO THE THERMOSTAT INSTALLATION SHEET FOR INTERNAL SCHEMATIC, THERMOSTAT CHECK-OUT PROCEDURES AND OTHER HVAC WIRING DETAILS

2ND

STAGE

AUX.

HEAT

FAN

RELAY

UNIT

1ST

STAGE

AUX.

HEAT

VAC

120

VAC

REV

VALVE

HEAT

2ND STG

COMP.

C R RSR RSC RSB RSA REF

BB+ AA+ B

1ST

STG

VALVE

REV

COOL

DEFROST

SERVICE

RC RH

O G

Red

(power)

Black (common)

(from MiniVerter)

FIG. 15 Typical heat pump wiring schematic

For additional HVAC system wiring diagrams (for Single-Stage Furnace and AC, TwoStage Furnace and Two-Stage AC, Roof-Top Unit (Two-Stage Heat and Two-Stage Cool), Boiler With AC (Two Transformers), and Single Stage Heat Pump Configurations, refer to the Wiring Diagrams section on page 29.

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Checking HVAC System Operation

Use the thermostat buttons to verify that the thermostat is controlling the equipment operation. A

checkout procedure is supplied in the installation instructions supplied with thermostat. This

procedure will verify only that the thermostat operates the equipment.

The HVAC installer may need to connect 24VAC to the R and C terminals to check HVAC

operation. If the automation system is to be installed after the HVAC installation, leave the R and C

terminals connected to ensure the HVAC system operates. If the automation system is installed

before either the placement of HVAC wiring or an external power supply is used, then do not

connect HVAC wires to R and C.

When the thermostat is first turned on all of the graphics of the main LCD are momentarily

displayed; this will look like FIG. 16.

Message display

Scroll/Set-Up buttons

Main (LCD) display

Adjust buttons

FIG. 16 Front panel (with all graphics on Main LCD displayed)

Check Out Procedure

The following check-out procedure will turn the heating and cooling equipment on and off. Do not operate in cooling at low outdoor temperatures. Do not operate in heating at high outdoor temperatures. Refer to the HVAC equipment manufacturer specifications for safe operating temperatures.

Use the Check Out procedure (below) to determine if the thermostat is controlling the HVAC

equipment.

1. Press the Mode button, and look for the OFF message on the Main display.

2. Press the Fan button. The system blower should start and the message FAN ON appears on the

Main display. Press Fan again to stop.

3. Press the Mode button until the COOL message appears, along with the current cool setting on

the Main display.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

4. Use the down arrow button to lower the set point 3°F below room temperature. In 5 to 10

seconds the first stage of cooling begins, and the COOL message icon begins to flash. If there

is a second stage it will begin in four minutes.

5. Press the Mode button until OFF appears n the Main display. During Check-out, change the

mode to override the Minimum On time delays.

6. Press the Mode button until the HEAT message appears, along with the current heat setting in

the Main display.

7. Use the up arrow button to raise the set point 3°F above room temperature. In 5-10 seconds, the

first stage of heating begins and the HEAT message icon begins to flash. If there is a second

stage it will begin in 4 minutes.

Heat Pump Only: The message HEAT -AUX is displayed when the auxiliary heat terminal

(W1) is energized. The LED on top of the thermostat will illuminate.

8. Press the Mode button until OFF appears in the Main display. During Check-out, change the

mode to override the minimum On time delays.

9. Press the Mode button until EM.HEAT appears on the Main display. Repeat step 7 to verify

Emergency Heat operation.

Optional HVAC Set-Up Features

There are a number of HVAC features that can be configured for the particular application. These

include temperature control options, display options and high/low balance points (heat pumps

only).

 Temperature control options

 Balance points

 Display options

To access these HVAC set-up features

When first powered up, the message display will scroll through the current mode status, fan status,

and heating/cooling output status. This is referred to as Passive Display because you do not interact

with it. To get into the Set-Up Menu, press the Enter and Mode buttons at the same time. This is

referred to as User Interactive Display, as the user navigates through various menu and sub-menu

selections to change variables.

Set-Up is menu driven but only one menu item is visible at a time. FIG. 32 on page 45 shows the

entire Main Menu. Selecting any one of the Main Menu items (by pressing the Enter button) will

enter a corresponding Sub-Menu. The Scroll Up and Scroll Down buttons are used to move

between menu items or change values.

The Enter button is used to select a menu item or enter a value. When in Thermostat Set-Up, if none

of the three navigation buttons are pressed in 5 minutes, the display will return to Passive Display.

For detailed information on accessing and using the various Set-Up menus, refer to the Set Up and

Configuration section on page 45.

ViewStat Communicating Thermostat

ViewStat Installation and Wiring

Address the Thermostats and Set Highest Address

These steps must be done at each thermostat for communication to work properly.

1. Press the Mode and Enter buttons simultaneously at the thermostat. It may take a couple of

tries to get them pressed together.

This will enter the Thermostat Set Up Menu. The first menu item that will appear on the text

messaging display is an informational item that indicates that only the Scroll Up, Scroll Down

(two buttons located immediately to the right of the text display) and the Enter buttons are used

in thermostat set up. This will remain on the display for approximately 5 seconds or until any

of the three aforementioned buttons are pressed. Thermostat Set Up is a series of sub-menu's

that allow you to customize the ViewStat in various ways. The Set Up and

Configuration section on page 45 outlines the set up features. The following steps will guide

you only through Communications Set Up sub-menu (FIG. 17).

Communications Set Up More

FIG. 17 Setting the thermostat address

Set Thermostat Address

Set Baud Rate More

EXIT

Network Address 1 to 64

No.of T-stats On the Network

Select

Back

9600

2. Press the Scroll Down button until the "Communications Set Up" menu shows on the display.

3. Press the Enter button to select this menu.

4. The first sub-menu item is "Set Thermostat ADDRESS". Press the Enter button to select this

item.

5. Set the address between 1 and 64 using the Scroll Up and Scroll Down buttons.

 Each thermostat must have a unique address (i.e. no two thermostats can have the same

address)

iewStat Communicating Thermostat

ViewStat Installation and Wiring

 Start with address 1 and increment by 1 for each new address - do not skip an address.

This will optimize communications speed.

Write down the address for each thermostat.

6. After the address has been selected, press the Enter button to store the address.

7. Use the Scroll Up and Scroll Down buttons to set the "Number of Stats on the Network" to the

highest address that will be on the thermostat network. This will be equal to the total number of

thermostats on the network (unless one or more addresses are skipped - see step 5).

This number must be set the same at each thermostat.

ViewStat

Red (power)

(from MiniVerter)

Black (common)

FIG. 24 First-stage radiant floor heat, second-stage furnace one stage of cooling configuration

IMPORTANT! The B terminal is for reversing valve-heat. DO NOT connect the B terminal to the common side of the transformer.

iewStat Communicating Thermostat

ViewStat Installation and Wiring

ViewStat Communicating Thermostat

Support Module Installation and Wiring

Follow the guidelines for placement of the support modules (as described below), and locate the

ViewStat indoors where the operating range of the ViewStat (32° - 99°F/0° - 37°C) will not be

violated (i.e. do not install in a cold garage or hot equipment room). Refer to the Support Module

Specifications section on page 3 for more information on the modules.

The thermostat will display one of the following sets of information:

 The remote temperature on the support module at address 1 if its mode is set to "control".

 The average temperature of all support modules set to "control".

 The humidity of the VST-TRH sensors set to the "control" mode.

Installing the VST-TTM and VST-TRH Support Modules

Choosing a mounting location

In choosing a mounting location for the support module(s), locate an interior wall surface in an area

free from drafts. The maximum distance from the thermostat is 1000 ft. (304.8 m).

 Do not mount support module on an exterior wall.

 Avoid routing wires near sources of noise such as computer monitors or fluorescent

lights.

Single Support Module Installation

1. Install the Viewstat according to the instructions in the ViewStat Installation and

Wir ing section on page 7. Check to ensure that thermostat is operating (display shows correct

temperature).

Remove the thermostat from its sub-base before wiring the support module to avoid damage from live wire.

2. Choose the wall location where the VST-TTM or VST-TRH module will be mounted. Run

CAT-5 wire from the thermostat to the support module location

(max distance = 1000 ft./304.8 m).

3. Open the support module case by pulling the cover straight forward, as shown in FIG. 25:

FIG. 25 Opening the support module case

ViewStat Communicating Thermostat

Support Module Installation and Wiring

4. Remove the circuit board from the base by pulling back the latch that holds it at the bottom

center, as shown in FIG. 26:

FIG. 26 Removing the circuit board

5. Use the sub-base as a template to mark the mounting hole locations on the wall. The word

"TOP" is written in the sub-base. Position the sub-base so that the wires can be pulled through

the hole in the top left-hand corner. Drill size for the wall anchors is 3/16 inch. Mount the

sub-base using the two #6 screws and anchors provided (larger screws will prevent the circuit

board from properly snapping into place).

Pull down

If side access is preferred for wiring, clip out the side vents on the scored lines (FIG. 27).

Cut here for access

FIG. 27 For side access, cut out the side vents on the scored lines.

6. Snap the circuit board back into the sub-base by sliding the top of the board in first and then

snapping down on the bottom. Check to be sure that the latch holds the board properly.

7. Strip ¼ inch of insulation from the four wires at the support module. Install the wires in the

terminals labeled RSR, RSC, RSB and RSA. One twisted pair of wires should be used for the

RSR and RSC connection and another pair of twisted wires should be used for the RSB and

RSA connection. Push the extra wire back into the wall cavity. Seal the hole in the wall

around the cable to eliminate any draft that might affect the sensor.

8. Connect the wires on the thermostat sub-base to the terminals labeled RSR, RSC, RSB and

RSA on the ViewStat base (see FIG. 5 on page 10) and the Communication and Equipment

Terminal Wiring Definitions table on page 21). Make sure that each terminal on the support

module is wired to the terminal with the same label at the thermostat.

9. If necessary, change the Support Module DIP switch settings as described in Setting the

Support Module DIP Switches section on page 40.

ViewStat Communicating Thermostat

Support Module Installation and Wiring

DIP switches must be set prior to powering the support module (support module is powered when thermostat is returned to its base). If switches need to be changed after powering the support module, the thermostat must be removed from its base for a minimum of 15 seconds to ensure proper reset of the support module.

10. Mount the thermostat on the sub-base and confirm that it is displaying the right temperature

from the support module or remote sensor.

Multiple Support Module Installation

Up to 4 support modules can be connected to provide temperature or humidity averaging in a large

area or for several zones being controlled by the same system. The maximum cumulative distance

of all the support modules from the ViewStat is 1000 ft (304.8 m).

FIG. 28 shows daisy-chaining of the VST-TTM Remote Temperature and VST-TRH Remote

Temperature/Humidity Sensors.

ViewStat (faceplate removed)

VST-TTM or VST-TRH support modules

VST-TSF

Flush-mount Indoor

remote sensor

FIG. 28 Daisy-chaining VST-TTM Remote Temperature and VST-TRH Remote Temperature/Humidity support modules

To other support modules

(maximum of 4 total)

VST-TSO

Duct/Outdoor

remote sensor

Always make sure that there is no power to the modules by removing the thermostat from the sub-base.

1. Remove the thermostat from the sub-base.

2. Wire the first sensor using the single support module instructions. Daisy chain the remaining

support modules as shown below (FIG. 29).

Thermostat Module 1 Module 2 Module 3 Module 4

RSR RSC RSB RSA

FIG. 29 Daisy-chaining support modules

3. Set the VST-TTM or VST-TRH Support Module DIP switches as described in the following

Setting the Support Module DIP Switches section.

4. Replace the thermostat on the sub-base. Check for proper operation of each sensor.

ViewStat Communicating Thermostat

RSR RSR RSR RSC RSC RSC RSB RSB RSB RSA RSA RSA

RSR RSC RSB RSA

Support Module Installation and Wiring

Setting the Support Module DIP Switches

Both the VST-TTM and VST-TRH support modules contain a 6-position DIP switch (FIG. 30)

located on the circuit board to set the support modules address, mode (monitor/control), and the

temperature sensor source (T1/T2 or Onboard Sensor). The ViewStat displays the temperature

reading of whichever remote sensors are connected to support modules in control mode. When

multiple support modules are connected and in control mode, the ViewStat displays an average of

all incoming temperature readings. If all connected support modules are set to monitor mode, then

the ViewStat displays the temperature reading from the on-board sensor, and the temperature from

the remote sensor (or the average temperature if you’re using multiple sensors) is displayed as the

REMOTE temperature.

1 2 3 4 5 6

FIG. 30 VST-TTM or VST-TRH support module DIP switch

OFF ON

ADDRESS

MONITOR (S1)

MONITOR (S2)

SPARE

T1/T2 (S1)

ADDRESS

CONTROL (S1)

CONTROL (S2)

SPARE

ONBOARD SENSOR

DIP switches 1 and 2: Address (1-4)

The following diagram shows how to set the top two address DIP switches. Each support module

must have its own address (1-4).

ADDRESS 1

ADDRESS 2

FIG. 31 Setting the top two address switches (switches 1 and 2)

ADDRESS 3

ADDRESS 4

DIP switch 3: Temperature Sensor 1

Each support module has two sensors: Sensor 1 and Sensor 2. Determine whether you want the

Sensor 1 input to monitor or control temperature. If DIP switch number 3 is in the "off " position, it

will monitor the temperature.

If the support module is set to Address 1 and the Sensor 1 input is set to "monitor", then the monitored temperature will be displayed as the remote temperature in the lower left hand corner of the thermostat. Otherwise, the monitored value will only be available through the home automation system.

If DIP switch 3 is set to the "on" position, it will use the Sensor 1 temperature to control the

thermostat. The sensor control temperature will be displayed on the thermostat. If multiple sensors

are daisy chained together, all of the sensors set to control will be averaged and the average

temperature will be displayed on the thermostat.

ViewStat Communicating Thermostat

Support Module Installation and Wiring

Dip switch 4: Temperature Sensor 2 (VST-TTM support module only)

Sensor 2 is for an external flush-mount or outdoor/duct temperature sensor for the VST-TTM

support module.

Determine whether you want the Sensor 2 input to monitor or control temperature. If DIP switch

number 4 is in the "off " position, it will monitor the temperature.

If DIP switch 4 is set to the "on" position, it will use the reported temperature to control the

thermostat. The sensor control temperature will be displayed on the thermostat. If multiple support

modules are daisy chained together, all of the sensors set to control will be averaged and the

average temperature will be displayed on the thermostat.

Dip switch 4: Humidity Sensor 2 (VST-TRH support module only)

Sensor 2 is for an onboard humidity sensor for the VST-TRH support module.

Determine whether you want the Sensor 2 input to monitor or control humidity. If DIP switch

number 4 is in the "off" position, it will monitor the humidity level (%).

If DIP switch 4 is set to the "on" position, it will control the humidity level and the value will be

displayed on the thermostat (with a % sign to indicate humidity). Up to 4 support modules can be

daisy chained together. All humidity sensors that are set to "Control" mode will be averaged and the

average humidity will be displayed on the thermostat.

If any of the remaining temperature sensors are also set to "control", the temperature control averaging will override the humidity control averaging and humidity control values will be ignored by the thermostat. To ensure that the thermostat recognizes humidity control values, make sure that all temperature sensors (for this thermostat) are set to the "Monitor" mode.

DIP switch 6: T1/T2 or Onboard Sensor

Determine whether you want the Sensor 1 input to use the temperature sensed by the onboard

thermistor or to use the input from a remote sensor (i.e. flush mount sensor or duct/outdoor sensor).

If DIP switch number 6 is in the "off" position it will use the remote sensor inputs (T1/T2). If the

DIP switch is in the "on" position, it will use the temperature input from the onboard thermistor.

This option only exists for the Sensor 1 input and can still be configured to monitor or control.

The ViewStat will not display temperature or humidity (Sensor 1 or Sensor 2) values if DIP switch 6 is set to T1/T2 without wiring a sensor to the T1/T2 terminal. If a sensor is connected to the T1/T2 terminal; DIP switch 6 MUST be set to Off or an invalid temperatures will be reported to the ViewStat.

ViewStat Communicating Thermostat

Support Module Installation and Wiring

Applications

Heat Pump Applications

If the support module is being used with a heat pump thermostat with auxiliary heat, the thermostat

can be configured to disable the use of auxiliary heat during warm weather and to lock out the

compressor when the outdoor temperature is too cold. This allows for the most efficient use of

energy.

At warmer temperatures, a heat pump will operate much more efficiently than the auxiliary heat. It

can save energy to disable auxiliary heat in some cases, for example, when returning from a setback

on a mild day. The temperature above which auxiliary heat is disabled is the auxiliary lockout

temperature or high balance point. Refer to the thermostat user manual for a detailed explanation.

Air-to-air heat pumps become less efficient as the outdoor temperature drops. The temperature at

which it becomes more efficient to use auxiliary heat instead of the heat pump is the balance point

or low balance point.

Configure the temperature sensor (T1/T2) that you are using to sense outdoor temperature to the

"Monitor" mode by setting the DIP switch 3 to the "off" position and the support module address to

number 1. The high and low balance points are set at the thermostat.

Humidity Control (VST-TRH only)

In order to set your thermostat up as a humidity controller, you will need at least one (up to four for

averaging) VST-TRH (temperature/humidity) support module(s) wired to the thermostat.

1. Locate the VST-TRH Support Module in the area that you want to control humidity.

2. Set the T3/T4 sensor (Humidity) Input to "Control" by moving the # 4 DIP switch to the "on"

position. Up to four T3/ T4 humidity sensors can be set to control and the reported values will

be averaged and displayed on the thermostat.

None of the temperature sensors connected to this ViewStat can be set to control mode because a control temperature input to the ViewStat will override a control humidity input. Make sure all temperature sensors connected to this ViewStat are set to "Monitor".

3. Once the humidity control sensor(s) have been wired to the ViewStat, the thermostat display

will change to indicate % RH instead of °F/°C. The thermostat mode selections will also

change to reflect humidity control. The modes are "Humidify", "Dehumidify", "Humidify or

Dehumidify" and "Off". Humidification/Dehumidification set points are changed the same way

that temperature control set points would be changed.

ViewStat Communicating Thermostat

Support Module Installation and Wiring

Mode of Operation Set to "Humidify"

The B terminal is continually energized in the "Humidify" mode. When the thermostat calls for

humidity, the W1/HUM terminal will energize. If the minimum off time of 2 minutes has not

elapsed since the previous call, no terminals will energize until it has. All energized terminals will

remain energized for the minimum on time of 2 minutes.

Mode of Operation Set to "Dehumidify"

The O terminal is continually energized in the "Dehumidify" mode. When the thermostat calls for

dehumidification, the Y1/DEHUM terminal will energize. If the minimum off time of 4 minutes

has not elapsed since the previous call, no terminals will energize until it has. All energized

terminals will remain energized for the minimum on time of 4 minutes.

Troubleshooting Remote Sensors

 Thermostat has no display: Check 24 VAC supply. Check for incorrect wiring between

the thermostat and support module. Incorrect wiring can damage the thermostat and

transformer or blow a fuse in the equipment.

Also, verify that all support modules have a unique address.

 Thermostat displays very high temperature or humidity: Ensure that DIP switch 6 is

set properly. If DIP switch 6 is set to T1/T2 and a sensor has not been wired to the T1/T2

terminal, no temperature or humidity readings will be displayed. Also, if DIP switch 6 is

set to onboard and a remote sensor has been wired to the T1/T2 terminal, incorrect

temperature readings will be displayed. Check wires on remote sensors (flush mount or

outdoor/duct) to ensure that they are not touching. If they are, separate them.

 Thermostat displays very low temperature: Remote sensor (flush mount or outdoor/

duct) is not connected to support module properly. Check wiring.

 Thermostat doesn't display remote temperature/humidity: Make sure that the

support module is set to address 1. Reset support module after changing any DIP

switches by turning off power for approximately 15 seconds.

 Thermostat displays RH instead of °F or °F instead of RH: Make sure that monitor/

control DIP switches are set correctly. Reset support module after changing any DIP

switches by turning off power for approximately 15 seconds.

ViewStat Communicating Thermostat

Support Module Installation and Wiring

ViewStat Communicating Thermostat

Set Up and Configuration

The ViewStat has many features that can be adjusted to customize operations. Temperature Control

Set Up, Balance Point Set Up and Communications Set Up, in particular, should only be adjusted

with the help of a qualified service technician.

When first powered up, the Message Display will scroll through the current mode status, fan status,

and Heating/Cooling output status. This is referred to as Passive Display because you do not

interact with it. To get into the set-up menu, press the Enter and Mode buttons simultaneously.

Thermostat Set-Up is menu driven but only again, one menu item is visible at a time. FIG. 32

shows the entire Main Menu. Selecting any one of the Main Menu items (by pressing the Enter

button) will enter a corresponding Sub-Menu. The Scroll Up and Scroll Down buttons are used to

move between menu items or change adjustable values. The Enter button is used to select a menu

item or enter a value. When in Thermostat Set-Up, if none of the three navigation buttons are

pressed in 5 minutes, the display will return to Passive Display.

Set Up and Configuration

Message display

Use to Scroll

Use to Select

Auto - 5 seconds

Network Override Set Up Next

Thermostat Lockout More

Security Set Up More

Communications Set Up More

Temperature Set Up More

Backlight Set Up More

Balance Points Set Up More

Press

to enter User-Interactive display

to select a menu item or to enter a value

Use the Scroll Up and Scroll Down buttons to move between menu items and change values.

FIG. 32 Main Menu

ViewStat Communicating Thermostat

Display Set Up

EXIT

Back

Select EXIT to return to the main menu from a sub-menu.

Select EXIT to return to passive display from the Main menu.

Set Up and Configuration

The following items are configured in thermostat set-up:

Network Override Set-Up

This enables or disables the Network Override feature. When Network Override has been invoked

the thermostat will only respond to the buttons of the thermostat; commands sent by the automation

system are ignored.

Pressing the Enter button activates Network Override. However, you can disable this feature if you

don’t want users to be able to activate Network Override. Enabling and Disabling of this feature is

done through Thermostat Set-Up (FIG. 33).

Network Override

Set Up Next

Enable Network

Override Next

Disable Network

Override Back

Net.Ovrd.Enabled

EXIT

Net.Ovrd.Disable

EXIT

MAIN MENU

FIG. 33 Network Override set-up

Thermostat Button Lockout

This feature partially or completely disables the buttons of the thermostat. For example, the MODE

and FAN status can be set and then locked, so the buttons will not allow those settings to be

changed. Additionally, this can be set to allow changes for a limited time and amount of change.

For example, you can limit temperature changes to ±3°, if desired (FIG. 34).

Thermostat Lockout More

Complete Lockout Next

Partial

Lockout More

Unlock Thermostat More

SetPoints, Fan & Mode Locked Out

Set Time Limit

Set Temp. Limit

min.

EXIT

FIG. 34 Thermostat Button Lockout

Back

Allow SetPoint Changes? Timed

Allow Fan Changes? Yes

Allow Mode Changes? Yes

EXIT

Time Val

Yes

Timed

Back

ViewStat Communicating Thermostat

Set Up and Configuration

Security Set-Up

This prevents unauthorized individuals from accessing Thermostat Set-Up. A code can be setup

that must be entered to gain entry into Thermostat Set-Up (FIG. 35).

Security

Set Up More

FIG. 35 Security set-up

Remove Password Next

Set New Password

Enter Lockout Code

ConfirmCode ####

change

EXIT

Back

after 4th digit entered

FIG. 36 shows the display when a password has been activated, and entry into Thermostat Set-Up

menu is attempted..

The master key password is 7777.

Security is On

Enter Code

after successful

attempt

Code Accepted

auto - 5 sec.

go to

Main Menu

FIG. 36 Master key password

To reset the password to 7777, you must cycle power to the ViewStat.

An easy way to cycle power on the ViewStat without having to remove power from the HVAC system is to remove the ViewStat faceplate from the base (see FIG. 2 and FIG. 3 on page 8), then replace it.

ViewStat Communicating Thermostat

after unsuccessful

attempt

Code Incorrect

after 3rd unsuccessful

attempt

return to

Passive display

Auto - 5 sec. after 1st and 2nd unsuccessful attempt

Set Up and Configuration

Communications Set-Up

This is where the thermostat address is entered. Additionally, the total number of thermostats (or

the highest addressed stat on the network) is entered here to optimize communication timing.

Consult a qualified service technician before changing any of the values in this Sub-Menu (Sub-

Menu not shown).

Temperature Set-Up

The first and second stage differentials can be changed, as can the display temperature offset. The

differentials set the tightness of the temperature control. If the equipment is operating too often, or

the temperature swings are uncomfortably large, the differentials can be increased or decreased

respectively. The temperature offset (calibration) allows the user to “customize” the temperature

shown on the display. Consult a qualified HVAC service technician before changing any of the

values in this Sub-Menu (Sub-Menu not shown).

Temperature Control Options

OFFSET Allows the user to offset the displayed room temperature ±3°F from true tem-

1ST STAGE DIFFERENTIAL Determines the level of control and consequently the cycle rate. Adjustable

2ND STAGE DIFFERENTIAL Again adjustable between 0.5°F and 2.0°F, this also determines the level of

perature. This thermostat is calibrated to be within ±1°F of true temperature.

between 0.5°F and 2.0°F, this is the value above/below the set point that the temperature must rise (fall) to start the cooling (heating). It is also the value below (above) the set point that the temperature must fall (rise) for the cooling (heating) to stop. For example, if the temperature setting was 70°F and the 1st stage differential was set at 0.5°F, in the heat mode the heat would come on at

69.5°F and stay until the temperature was 70.5°F. A small differential will result in a tighter control, but more heating/cooling cycles.

control by determining when to use the 2nd stage of heating or cooling. It can also be used to keep 2nd stage cooling from coming on too soon when 1st stage is acting to control temperature levels or to keep costly auxiliary heat from coming on too soon when the heat pump is sufficient.

Backlighting Set-Up

Both displays have backlighting which can be controlled in three ways (FIG. 37). First,

backlighting can be turned on every time a button is pushed. Second, it can be configured to come

on with a button push, but only when the ambient light is below a preset value. When “only when

needed” is selected, the user can select from two levels of ambient light. Finally, it can be disabled.

ViewStat Communicating Thermostat

Set Up and Configuration

Backlight

Set Up More

FIG. 37 Backlighting set-up

On With Every

Change Next

On Only When Needed

Disable

EXIT

Set, 1=lighter 2-darker

toggle between 1 and 2 using the Up and Down buttons

Back

Balance Point Set-Up

Balance points limit heat pump operation when the outdoor temperature is too high or too low. It

requires an optional support module with an outdoor temperature sensor. Consult a qualified HVAC

service technician before changing any of the values in this Sub-Menu (Sub-Menu not shown).

These values are adjustable, but are only used by the thermostat when it has been configured to

operate as a heat pump, and when a remote outdoor temperature sensor (with address #1) is wired

to the thermostat (see the Heat Pump Applications section on page 42 for details).

Balance Point Options

LOW BALANCE POINT the outdoor temperature below which compressor terminals will not be energized.

HIGH BALANCE POINT the outdoor temperature above which the auxiliary heat terminal will not be ener-

gized in the HEAT mode (does not effect Emergency Heat operation).

Display Set-Up

Here the temperature scale can be changed to °C or °F, and the temperature settings can be setup to

always display or only when being changed (FIG. 38). The message display, when not being used

for Thermostat Set-Up will, by default, scroll through three messages showing the status of the

mode, fan, and equipment output. A fourth, date and time, can also be displayed in the scroll list.

Display Set-Up Options

TEMPERATURE SCALE all temperatures displayed including room temperatures and set points can be

°F or °C.

SHOW TEMPERATURE SET POINTS ALWAYS

SHOW TEMPERATURE SET POINTS ONLY IF CHANGED

keeps the temperature settings visible on the display at all times.

displays the temperature settings (heat and/or cool) only when the user changes them. The first press of either the up or down adjust buttons will display the settings.

ViewStat Communicating Thermostat

Set Up and Configuration

Display Set-Up Options (Cont.)

SHOW DATE AND TIME the message display will, by default, scroll three messages showing the status

of the mode, fan and equipment outputs. A fourth, date and time, can also be displayed in the scroll list.

Display

Set Up More

FIG. 38 Display set-up

Temperature

°F°C F

Scale

Show Temp Setpts Always

Show Setpts Only If Changed

Display Time and Date?

EXIT

Yes

Back

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

AMX_ViewStat NetLinx Module - Overview

The ViewStat Communicating Thermostat may be controlled from a NetLinx system using the

AMX_ViewStat NetLinx module. This module requires ViewStats to be connected through an

ICSNet interface.

The ViewStat module is designed to save you the work of manually coding the entire ViewStat

command set. By using the module, you’ll save time, and still take full advantage of the ViewStat’s

features. While it is strongly recommended that you use the NetLinx module, it is also possible to

write your own code "from scratch".

For a detailed description of the NetLinx programming protocol for the ViewStat, refer to the "ViewStat Programming Protocol Reference Manual", available on the AMX.COM web site.

When connecting thermostats (thermostat/mini-verter pair), it is best to initialize each mini-verter

separately. If all mini-verter devices have the same device number and are on the bus at the same

time, an initialization problem can occur where all devices obtain the same new device

identification number. This is different from the serial number of the thermostat that is set locally at

the thermostat.

The ViewStat may be controlled from a NetLinx system using the AMX_ViewStat NetLinx

module. This module requires ViewStats to be connected through an ICSNet interface. The number

of thermostats is limited by the number of ICSNet devices that may be connected at one time to the

master. The initialization sequence is shown below.

DEFINE_DEVICE VST = 34001:1:0 VST_1 = 1:1:0 VST_2 = 2:1:0 VST_OPS = 33001:1:0

DEFINE_VARIABLE VST_ZoneCnt = 1 Scale = 1

dev VSTArry[] = { VST_1, VST_2 } integer VSTStatNum[] = { 1, 1 } DEFINE_MODULE 'AMX_VST' myVST (VSTArry, VST_OPS, VSTStatNum, VST_ZoneCnt, Scale)

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

It is important that the serial number array be the same length as the device array. If the serial

number array happens to be shorter, the length will be set to that of the device array and the new

members of the array will be set to the value 1. The two arrays are used to associate the ICSNet

device number to the stat number of the thermostats (set locally through the thermostat's user

interface)

Upon initialization, the VST module will retrieve the current settings of all of the thermostats on

the network. This operation may take several seconds. During this time the NetLinx program will

start receiving strings representing the states of all of the thermostat's controls. The above default

temperature scale is Fahrenheit.

The ViewStat Communicating Thermostat is an enhanced version of the OPStat with the

communication board built into the thermostat, advanced features and two displays. One display is

for temperature, mode, limit settings, lock status, fan status, network communication and humidity.

The second display is used for general text messaging for date, time, event status, and setup mode

and user notifications.

The ViewStat can monitor remote temperature and humidity, has a flexible text mode setup and

interface, and has the ability to lock local control of the thermostat.

Care must be taken when attaching to remote sensors in that the remotes can turn the thermostat

into a humidity sensor that doesn't display the temperature in the main window. When acting as a

humidity sensor, the temperature can be retrieved through the control interface only. The remote

temperature is displayed in minor sections of the main window while the remote humidity inhabits

the window center. When a remote sensor is attached, humidity changes do not generate a Change

Of State message. Also, as a humidity sensor, the mode button will change from humidity to

dehumidify and report accordingly over the control interface. To retrieve humidity, there is a

conditional poll generated upon temperature events if the temperature event came from a humidity-

supported device.

The VST_ZoneCnt is used to affect the wait period between successive commands being sent to the

thermostats. The larger the VST_ZoneCnt value is, the longer the time delay between global

commands becomes. The VST_ZoneCnt variable is associated with the serial number of a

thermostat.

To install the ViewStat module, the developer must create an array of devices and an array of

integers that stand for the serial number of the thermostat corresponding to the physical ICSNet

device. Unless otherwise needed, the serial number of all thermostats should be set to '1', to allow

the quickest response from the thermostat on global commands.

ViewStat also provides feedback from its local buttons: enter, scroll up, and scroll down. This

allows the control system to track the menu navigation if desired.

The following diagram gives a graphical view of the interface between the NetLinx program and

the NetLinx module.

NetLinx

Program

FIG. 39 Interface between the NetLinx program and the NetLinx module.

Virtual Device

NetLinx

Module

ViewStat Controller

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

The ViewStat Model

The model will define a security system as consisting of the following components:

1. System: This refers the controller and all that it controls.

2. Zone: The system will consist of one or more ViewStat zones. A zone is nothing more than an

area that can be controlled separate from other areas. Zones have their own temperature

settings.

3. Thermostat: Each zone contains a thermostat. The thermostat is used for reading temperature

and controlling when to turn on/off equipment as needed to maintain the desired temperature

setting. Thermostats can control fans, heat, A/C., etc.

4. Setpoint: There are two types of setpoints: heat and cool. When the temperature reaches or

falls below the heat setpoint the thermostat will turn the heat on (call for heat). When the

temperature reaches or exceeds the cool setpoint the thermostat will turn the air conditioner on

(call for air). These are also called comfort points. A user can keep the temperature within

these points at all times by setting the setpoint values. For example, to maintain a temperature

of 68-72 degrees the heat setpoint would be set to 68, the cool setpoint would be set to 72.

While the temperature is within this range nothing is done. Once the temperature falls outside

this range the system takes action and switches to the appropriate mode.

5. Humidify/Dehumidify: Some systems can maintain the humidity level within a certain range.

These are similar to temperature setpoints except instead of temperature control equipment the

system is controlling humidify and dehumidify equipment.

Command Interface - SEND_COMMANDs

Various system wide operations may be performed by the NetLinx program via SEND_COMMANDs

sent to the virtual device controlling the thermostats.

The supported commands are listed below.

Command Interface - SEND_COMMANDs

Command Description

'T-<tstat> COOL-<val>'

'T-<stat> COOL?'

Set cool set point.

Parameters:

• <tstat> : id of thermostat/zone

•<val>:

+ = increase cool set point by one degree

- = Decrease cool set point by one degree

60-108 = new cool set point (F)

Examples:

'T-4 COOL--'

'T-1 COOL-76'

Query for current cool set point.

Parameter:

• <tstat>: id of thermostat/zone

Example:

'T-16 COOL?'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

Command Interface - SEND_COMMANDs (Cont.)

Command Description

'T-<tstat> DATE-<val>'

'T-<tstat> DATE?'

'T-<tstat> DEHUMIDIFY-<val>'

'T-<stat> DEHUMIDIFY?'

'T-<stat> FAN?'

'T-<tstat> FMODE-<val>'

'T-<stat> FMODE?'

Set date.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : MMDDYY

Example:

'T-1 DATE-030894'

Requests current date on thermostat

Set dehumidify set point.

Parameters:

<tstat> : id of thermostat/zone

<val>:

+ = Increase dehumidify set point by one percent

- = Decrease dehumidify set point by one percent

10-90 = dehumidify set point (in percent)

Example:

'T-6 DEHUMIDIFY-70'

Query for current dehumidify set point.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-1 DEHUMIDIFY?'

Query for current fan state.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-2 FAN?'

Set fan mode.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 0 = let thermostat control the fan

1 = turn fan on

T = toggle fan mode

Example:

'T-12 FMODE-AUTO'

Query for current fan mode.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-2 FMODE?'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

Command Interface - SEND_COMMANDs (Cont.)

Command Description

'T-<tstat> HEAT-<val>'

'T-<stat> HEAT?'

'T-<tstat> HMODE-<val>'

'T-<stat> HMODE?'

'T-<tstat> HOLD-<val>'

'T-<stat> HOLD?'

Set heat set point.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

+ = increase heat set point by one degree

- = decrease heat set point by one degree

38..88 = new heat set point (F)

Examples:

'T-1 HEAT-+'

'T-1 HEAT-68'

Query for current heat set point.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-4 HEAT?'

Set humidify mode.

Parameters:

• <tstat> : id of thermostat/zone

•<val>:

OFF = disable (no humidity control)

HUMID = enter humidify mode

DEHUM = enter dehumidify mode

AUTO = automatically control humidity based on humidify and dehumidify set points.

T = toggle humidify mode

Example:

'T-6 HMODE-AUTO'

Query for current humidify mode.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-22 HMODE?'

Set thermostat hold state.

Parameters:

• <tstat> : id of thermostat/zone

•<val>:

0 = take thermostat out of hold mode

1 = place thermostat in hold mode

T = toggle hold state

Example:

'T-2 HOLD-ON'

Query for current hold state.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-1 HOLD?'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

Command Interface - SEND_COMMANDs (Cont.)

Command Description

'T-<tstat> HUMIDIFY-<val>'

'T-<stat> HUMIDIFY?'

'T-<tstat> HUM?'

'T-<tstat> ID?'

'T-<tstat> LIGHT-<val>'

'T-<tstat> LOCK-<val>'

'T-<stat> LOCK?'

Set humidify set point.

Parameters:

• <tstat> : id of thermostat/zone

•<val>:

+ = Increase humidify set point by one percent

- = Decrease heat set point by one percent

10-90 = humidify point (in percent)

Example:

'T-6 HUMIDIFY-30'

Query for current humidify set point.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-1 HUMIDIFY?'

Query for current inside humidity.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-14 HUM?'

Get thermostat identification number.

Control backlight on thermostat.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

0 = off

1 = on

T = toggle

Example:

'T-1 LIGHT-T'

Set thermostat lock state.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

0 = unlock thermostat

1 = lock thermostat

T = toggle lock state

Example:

'T-2 LOCK-ON'

Query for current lock state.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-10 LOCK?'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

Command Interface - SEND_COMMANDs (Cont.)

Command Description

'T-<tstat> MENU-<val>'

'T-<tstat> MENU?'

'T-<tstat> MODE-<val>'

'T-<stat> MODE?'

'T-<tstat> MSG-<text>'

'T-<tstat> OUTHUM?'

'T-<tstat> OUTTEMP?'

'T-<tstat> PASSTHRU-<data>'

When on, displays text as set by the MSG command.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

1 = enables display of 'msg' message

0 = disables display of 'msg' message

Gets the current menu state

Set HVAC mode.

Parameters:

• <tstat>: id of thermostat/zone

•<val>:

OFF = disable (no cool, no heat)

HEAT = enter heat mode (no cool)

COOL = enter cool mode (no heat)

AUTO = let thermostat control heat and cool based on set points.

T = toggle HVAC mode

Example:

'T-6 MODE-AUTO'

Query for current HVAC mode.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-1 MODE?'

Displays text on thermostat window when MENU is enabled.

Query for current outside humidity.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-14 OUTHUM?'

Query for current outside temperature.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-2 OUTTEMP?'

Send data to thermostat with no processing by the module. The user can use this to send commands directly to the thermostat.

Parameters:

• <tstat>: id of thermostat/zone

• <data> : data to send to thermostat

Example:

'T-1 PASSTHRU-SOME COMMAND TO SEND'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

Command Interface - SEND_COMMANDs (Cont.)

Command Description

'T-<tstat> TEMP?'

'T-<tstat> TIME-<val>'

'T-<tstat> TIME?'

'T-<tstat> TXT-<line>,<val>'

'T-<tstat> TXT?<line>'

'SCALE-<val>'

'SCALE?'

'USEDEBUG-<val>'

'USEDEBUG?'

'VERSION?'

Query for current inside temperature.

Parameter:

• <tstat> : id of thermostat/zone

Example:

'T-4 TEMP?'

Set time.

Parameters:

• <tstat> : id of thermostat/zone

• <val>: HHMMSS (24-hour clock)

Example:

'T-1 TIME-163248'

Requests current time on thermostat.

Set text message to be displayed in rolling message.

Parameters:

• <tstat> : id of thermostat/zone

• <line>: 1-4 = message number to be set

• <val> : string of text

Example:

'T-8 MSG-1,Hello World!'

Read text to be displayed on thermostat.

Parameters:

• <tstat> : id of thermostat/zone

• <line>: 1-4 = message number to read

• <val> : string of text

Example:

'T-8 MSG-1,Hello World!'

Global command to set the temperature scale.

Parameter:

• <val> :

C = Celsius

F = Fahrenheit (default)

Example:

'SCALE-F'

Query for the current temperature scale.

Example:

'SCALE?'

Global command to enable the sending of debug data to device 0.

Parameter:

•<val>:

1 = enables

0 = disables

Query for the current debug state.

Query for the current version number of the NetLinx module.

Example:

'VERSION?'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

String Feedback

The NetLinx module will provide feedback to the glue code for ViewStat system changes via string

events. Below are the strings supported. Data coming from the module will be in the form of

strings. Data going to the module will be in the form of commands.

String Feedback

String Description

'T-<tstat> COOL-<val>'

'T-<stat> DATE-<val>'

'T-<tstat> DEHUMIDIFY-<val>'

'T-<stat> FAN-<val>'

'T-<tstat> FMODE-<val>'

'T-<tstat> HEAT-<val>'

Reports current cool set point.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 60..108 = new cool set point (F)

Example:

'T-1 COOL-76'

Reports thermostat date.

Parameter:

• <val>: MMDDYY, 062102 = (June 21, 2002)

Reports current dehumidify set point.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 2-99 = dehumidify set point (in percent)

Example:

'T-6 DEHUMIDIFY-70'

Reports current fan state.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

0 = fan is off

1 = fan is on

Example:

'T-2 FAN-1'

Reports current fan mode.

Parameters:

<tstat> : id of thermostat/zone

<val> : ON = fan on

AUTO = thermostat will control the fan

Example:

'T-12 FMODE-AUTO'

Reports current heat set point.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 38..88 = current heat set point (F)

Example:

'T-1 HEAT-68'

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

String Feedback (Cont.)

String Description

'T-<tstat> HMODE-<val>'

'T-<tstat> HOLD-<val>'

'T-<tstat> HUM-<val>'

'T-<tstat> HUMIDIFY-val>'

'T-<stat> ID-<val>'

'T-<tstat> LOCK-<val>'

'T-<stat> MENU-<val>'

Reports current humidify mode.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

OFF = disabled (no humidity control)

HUMID = humidify mode

DEHUM = dehumidify mode

AUTO = automatically controlled based on humidify and dehumidify set points.

Example:

'T-6 HMODE-AUTO'

Reports current thermostat hold state.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

ON = thermostat in hold mode

OFF = thermostat no in hold mode

Example:

'T-2 HOLD-ON'

Reports current inside humidity.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 0..100 = humidity level (%)

Example:

'T-14 HUM-56'

Reports current humidify set point.

Parameters:

<tstat> : id of thermostat/zone

<val> : 0-97 = humidify point (in percent)

Example:

'T-6 HUMIDIFY-30'

Reports identification number of thermostat.

Reports current thermostat lock state.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

ON = thermostat is locked

OFF = thermostat is unlocked

Example:

'T-2 LOCK-ON'

Reports Menu state, ON/OFF.

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

String Feedback (Cont.)

String Description

'T-<tstat> MODE-<val>'

'T-<tstat> OUTHUM-<val>'

'T-<tstat> OUTTEMP-<val>'

'T-<stat> PMES<num>-<val>'

'T-<tstat> TEMP-<val>'

'T-<stat> TIME-<val>'

'T-<tstat> TXT-<line>,<val>'

Reports current HVAC mode.

Parameters:

• <tstat> : id of thermostat/zone

• <val> :

OFF = disabled (no cool, no heat)

HEAT = heat mode (no cool)

COOL = cool mode (no heat)

AUTO = thermostat automatically controls heat and cool based on set points.

Example:

'T-6 MODE-AUTO'

Query for current outside humidity.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : 0..100 = humidity level (%)

Example:

'T-8 OUTHUM-68'

Reports current outside temperature.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : current outside temperature

Example:

'T-2 OUTTEMP-84'

Reports scrolling message.

Parameters:

• <num>: message 1-4

• <val>: data that message happens to be

Reports current inside temperature.

Parameters:

• <tstat> : id of thermostat/zone

• <val> : current inside temperature

Example:

'T-4 TEMP-76'

Reports thermostat time.

Parameter:

• <val>: HHMM, 1630 = (4:30 p.m.)

Reports the text to be displayed for that message.

Parameters:

• <tstat> : id of thermostat/zone

• <line>: 1-4 = message number

• <val> : string of text

Example:

'T-2 MSG-2, 'Went shopping''

ViewStat Communicating Thermostat

Using the NetLinx Module to Program the ViewStat

String Feedback (Cont.)

String Description

'SCALE-<val>'

'USEDEBUG-<val>'

'VERSION=xx.yy'

Reports current temperature scale.

Parameter:

• <val> :

C = Celsius

F = Fahrenheit (default)

Example:

'SCALE-F'

Displays debug state.

Parameter:

• <data> :

1 = enabled

0 = disabled

Reports current version number of the NetLinx module.

Example:

'VERSION=2.46'

ViewStat Communicating Thermostat

Operating the Thermostat

This section describes the front panel components, and gives instructions for operating the

ViewStat thermostat. FIG. 40 shows the front panel.

Front Panel Components

Message Display

Two types of messages are displayed, Permanent and Temporary Messages. Permanent Messages

are those that scroll continually during thermostat operation. Temporary (flashing) Messages are

intended to catch your eye and must be reset to be removed from the display. Thermostats are

shipped with default (permanent) status messages (i.e. mode status, fan status, equipment status).

Operating the Thermostat

essage display

Scroll/Setup buttons

Main display

Mode button

Adjust buttons

FIG. 40 ViewStat Thermostat (front panel)

Enter button

Fan button

Scroll/Set-up buttons

The Scroll/Set-Up buttons function with the set-up features of the thermostat (refer to the Set Up

and Configuration section on page 45 for details).

Mode button

Five modes of operation are available on the ViewStat thermostat:

 OFF

 COOL

 AUTO

 HEAT

 EM. HEAT (for heat pumps only)

The mode of operation indicates how you want your heating and cooling equipment to operate.

ViewStat Communicating Thermostat

Operating the Thermostat

Adjust buttons

The Adjust buttons adjust the heating and cooling temperature settings.

Fan button

The fan can be operated continuously (

FAN ON) or only when there is a need to heat or cool.

Enter button

The Enter (or Network Override) button is used to override the home automation system, to clear

temporary flashing messages on the message display and with the set-up features of the thermostat.

Main display

The Main display (FIG. 41) provides the mode status, temperature and system status information.

Network Status

Network Override

Remote Temperature/

Relative Humidity

FIG. 41 Main Display window

Room Temperature Relative Humidity

Lockout

Fan Status

Set Points

Mode Status

The following table describes the items on the Main display:

Main Display

MODE STATUS Shows the current mode of operation: OFF, COOL, HEAT or COOL, EM. HEAT

(for heat pumps only), and HEAT. The current mode will flash to show when the equipment is running.

SET POINTS Shows the Heating and/or Cooling temperature settings.

FAN STATUS FAN ON indicates the fan is set to operate continuously.

LOCKOUT The lockout setting shows the thermostat buttons have been locked out and the

ROOM TEMPERATURE Shows the current room temperature. The temperature can be displayed in °F or

REMOTE TEMPERATURE/ RELATIVE HUMIDITY

NETWORK OVERRIDE When NETWORK OVERRIDE is displayed, the thermostat has been taken off-

NETWORK STATUS This computer icon shows the thermostat is connected to the system. The icon

thermostat settings can not be changed at the thermostat.

°C. This would show relative humidity (%) if the thermostat has been installed with an optional humidity control sensor.

A temperature and/or a relative humidity value will be displayed alternately here when an optional remote temperature and/or humidity sensor has been installed (typical use is for outdoor temperature).

line from the system. The thermostat can then only be operated at the thermostat.

will flash when the thermostat sends or receives information. If there is no activity on the system for 15 minutes the icon will be crossed out. This does not mean the thermostat is unable to communicate, only that there has been no communication to this thermostat in 15 minutes.

ViewStat Communicating Thermostat

Operating the Thermostat

Operating The Thermostat

Notes on temperature adjustments:

 The COOL setting must always be a minimum of 2° (F or C) higher than the HEAT setting.

The thermostat will automatically maintain the 2° difference. For example, if the Cooling

set point is 75°F and one changes the Heating set point to 74°F, the thermostat will

automatically change the Cooling set point to 76°F.

 The lockout icon will appear on the display when attempting to make a change, if the

thermostat has been configured to be locked out or the desired change violates the

thermostat limits (i.e. lowest allowable

setting is 90°F, etc.). Lockout configuration can be altered in set-up menu (see the

Thermostat Button Lockout section on page 46).

Selecting the Mode

HEAT setting is 40°F, highest allowable COOL

The thermostat can be set to

pumps only), and

HEAT modes. To set, press the Mode button until the desired mode appears on the

OFF, COOL, HEAT or COOL (auto-changeover), EM. HEAT (for heat

display (FIG. 42).

Off Cool

HEAT COOL EM. HEAT

Heat or Cool Emergency Heat

HEAT

Heat

FIG. 42 Mode messages

 The following table describes each of the modes:

• OFF Select the OFF mode to prevent the heating and cooling equipment from operating.

• COOL COOL appears on the display and only the cooling equipment will be operated to maintain the temperature at the COOL setting. COOL will flash on the main display when the cooling equipment is operating.

• HEAT HEAT appears on the display and only the heating equipment will be operated to maintain the temperature at the HEAT setting. HEAT will flash on the main display when the heating equipment is operating.

• AUTO (heat or cool auto-

changeover)

• EMERGENCY HEAT

(EM. HEAT for heat pump equipment only)

HEAT or COOL appears on the display. Either the heating or cooling equipment will operate to maintain the room temperature at or above the HEAT setting and at or below the COOL setting. HEAT or COOL will flash when the respective equipment is operating.

EM. HEAT appears on the display and only the back-up heat source will be operated to maintain the room temperature above the HEAT setting. This is generally more expensive than using the heat pump (HEAT MODE), so use accordingly. Typical usage is when the heat pump has malfunctioned.

ViewStat Communicating Thermostat

Operating the Thermostat

–

Do not set to OFF mode during periods when freezing temperatures could occur.

Setting temperatures

Press the Up or Down adjust button. The setting to be changed will begin to flash. Press and hold

the button to change the setting.

 If operating in the HEAT mode, the only temperature set point available to change is the

Heat setting. When the room temperature drops below this setting the heat will come on

(call for heating) to raise the temperature.

 If operating in the COOL mode, the only temperature set point available to change is the

COOL setting. When the room temperature rises above this setting the Cooling will come

EM. HEAT mode uses the HEAT setting.

on (call for cooling) to lower the temperature.

 If operating in AUTO (HEAT or COOL) mode, the first press of the Up or Down adjust

button will indicate which of the two temperature settings will be adjusted – it will be the

one flashing.

 If this is not the desired temperature to adjust, press the Mode button to access the other

temperature setting.

Fan operation

The thermostat can operate the fan either continually (

Cooling calls. Press the Fan button to toggle between these two options.

FAN ON), or only during Heating and

FAN ON is recommended

for media/electronic air cleaners, ventilating equipment, and to allow for humidification in mild

climates.

Backlight operation

Operation of the backlight is configured in the Thermostat Set-Up. Depending on the set-up, the

backlight will light at the press of any button, or it can be disabled (see the Backlighting Set-

Up section on page 48). The backlight will stay on for 10 seconds after the last press of a button.

Network override

If the Network Override has not been disabled in the Thermostat Set-Up, the Network Override can

be initiated by pressing the Enter button. When initiated, the thermostat is taken offline from the

automation system. The thermostat can then only be operated at the thermostat. Pressing the Enter

button again will restore network communication.

Clearing a temporary flashing message

Custom Home Automation systems have the ability to send a temporary message to the message

display. This message will flash until the user acknowledges the message. To acknowledge message

press the Enter button.

ViewStat Communicating Thermostat

Operating the Thermostat

In Case Of Power Failure

This thermostat does not require a battery. If the power goes out, the screen is blank. During the

period the power is off, the heating/cooling system will not operate. When power is restored, the

thermostat will return to the previous settings. The thermostat is equipped with a continuous

memory feature which does not require a battery.

Cleaning the Thermostat

If the surface of the thermostat becomes dirty it can be cleaned with plain water or with a non-

abrasive household cleaner, including glass cleaner. When using any cleaner be careful not to get

any into the interior of the thermostat. Do not spray any liquid directly onto the thermostat. Spray

the cleaner onto a soft cloth and wipe the surface of the thermostat.

ViewStat Communicating Thermostat

Operating the Thermostat

ViewStat Communicating Thermostat

Operating the Thermostat

iewStat Communicating Thermostat

AMX reserves the right to alter specifications without notice at any time.

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3000 RESEARCH DRIVE, RICHARDSON, TX 75082 USA • 800.222.0193 • 469.624.8000 • 469-624-7153 fax • 800.932.6993 technical support • www.amx.com

062-004-2626 3/05

In Canada doing business as Panja Inc.

Last Revision: 03/21/05

AMX VIEWSTAT COMMUNICATING THERMOSTATS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Product Information

Introduction

System Components

ViewStat Specifications

Support Module Specifications

Maximum Cable Distances

HVAC System Pre-Installation Check List

ViewStat Installation and Wiring

Disconnecting Power to All HVAC Equipment

Selecting the Thermostat Location

Stand-alone thermostat mounting criteria

With remote temperature sensors

Removing the Faceplate from the Base

Setting the DIP Switch

Reassembly

Attaching the MiniVerter to the ViewStat

Wiring the VST-TSTAT to a VST-DIST Distribution Panel

Mounting the Base to a Wall

Connecting the ViewStat to AMX Control Systems

Connecting to an Axcess Control System (via AXC-232++, AXB-EM232, or Axcent3/ PRO)

Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port

Connecting to NetLinx Integrated Controllers via the RS232/422/485 (DB-9) Port

Connecting to a NetLinx Master controller via NXC-COM card

Connecting to a LandMark Control System

Installing the Cat5 Suppression Ferrite

Connecting to a NetLinx Control System

Connecting to a Landmark Control System

Connecting the ViewStat to the HVAC System

Installing the 24 VAC Suppression Ferrite

Wiring the Thermostat

Communication and Equipment terminal wiring definitions

Connecting the ViewStat to the HVAC System

Checking HVAC System Operation

Check Out Procedure

Optional HVAC Set-Up Features

To access these HVAC set-up features

Address the Thermostats and Set Highest Address

Wiring Diagrams

Single-stage furnace and AC configuration.

Two-stage furnace and two-stage AC configuration.

Roof top unit (two-stage heat and two-stage cool) configuration.

Boiler with AC (two transformers) configuration.

Single-stage heat pump configuration

Two-stage heat pump configuration.

First- stage radiant floor heat, second-stage furnace one stage of cooling configuration.

Support Module Installation and Wiring

Installing the VST-TTM and VST-TRH Support Modules

Choosing a mounting location

Single Support Module Installation

Multiple Support Module Installation

Setting the Support Module DIP Switches

DIP switches 1 and 2: Address (1-4)

Dip switch 4: Humidity Sensor 2 (VST-TRH support module only)

DIP switch 6: T1/T2 or Onboard Sensor

Applications

Heat Pump Applications

Humidity Control (VST-TRH only)

Troubleshooting Remote Sensors

Set Up and Configuration

Network Override Set-Up

Thermostat Button Lockout

Security Set-Up

Communications Set-Up

Temperature Set-Up

Backlighting Set-Up

Balance Point Set-Up

Display Set-Up

Using the NetLinx Module to Program the ViewStat

AMX_ViewStat NetLinx Module - Overview

The ViewStat Model

Command Interface - SEND_COMMANDs

String Feedback

Operating the Thermostat

Front Panel Components

Message Display

Mode button